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<title>求平均年龄</title>
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<script type="text/javascript">
    var arr = ['23','22','20','26','27','21'];
    var age = 0;
    for(var i=0; i<arr.length; i++) {
        age += parseInt(arr[i]);
    }
    var avg = age/arr.length;
    document.write('平均年龄为：' + Math.round(avg));
</script>

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